Update

- New main menu.

- New models added to the level.

- improved effects.

- Improved enemy behavior.

- The "office" level has been redesigned.

- An experimental random weapon system with a roguelite element has been added to the reworked level. In the near future, a lot of new weapons, weapon attachments and vending machines selling various items will be added. For a full and more balanced operation of the roguelight system, a hard mode will also be added.